Springfield Mark 1 rear sight marked O.L.

Good day, looking for information on this rear sight marked O.L.
Any information most appreciated.
Best,
Chris

Oneida limited I believe they were a WW11 subcontractor.

There is alot of different WW2 contractors, the O.L. is Oneida

here are a few more

Left: Rock Island Perry point RAttachment 119811Attachment 119810Attachment 119812emington


The Rock Island is late WW1 without top notch

Thanks for reply.
Best,
Chris